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Finding the Fourth Proportional to 710.72, 980.88 and 449

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Solution

The fourth proportional to 710.72, 980.88 and 449 is: 619.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.72 : 980.88 = 449 : x
  2. Step 2: Convert to fraction form
    710.72/980.88 = 449/x
  3. Step 3: Cross multiply
    710.72x = 980.88 × 449
  4. Step 4: Simplify right side
    710.72x = 440,415.12
  5. Step 5: Solve for x
    x = 440,415.12/710.72
  6. Step 6: Final answer
    x = 619.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.